<!DOCTYPE html>
<html lang="en">
<head>
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">

<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->
<script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>
    <meta charset="UTF-8">
    <title>{%block title%}{% endblock %}</title>
</head>
<body>
<div class="container-fluid">
    {%include 'header.html'%}
    <div class="panel panel-default">
        {% block headmessage %}{% endblock %}
    </div>

    <hr>
    <div class="panel-body">

        {%block content%}{%endblock%}
    </div>
    <hr>
    <div class="panel-footer">
        {% include 'footer.html' %}
    </div>
</div>
</body>
</html>